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【单选题】
He is very ____________. He always go to work on time.
A.
modest
B.
fair
C.
punctual
D.
skillful
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参考答案：
举一反三
【简答题】如图，在菱形ABCD中，∠BAD=2∠B，AB=6cm，则AC=（    ）cm。
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【单选题】如图，在菱形ABCD中，∠A=60°，E、F分别是AB、AD的中点．若EF=2，则菱形ABCD的边长为（　　）
A.
4
B.
5
C.
6
D.
7
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【单选题】what is gene?
A.
DNA that encodes specific protein
B.
RNA
C.
codon
D.
allele
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【单选题】What is the primary objective of carrying out the Pine Gene Discovery Project?
A.
To speed up old-fashioned breeding methods.
B.
To identify all the genes in the pine tree's genome.
C.
To find out what desired traits the pine trees have.
D.
To make it easier to know which gene needs altering.
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【单选题】The cI gene of phage is of what type?
A.
Repressor
B.
Inducer
C.
Promoter
D.
Silent gene
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【多选题】What are the major hurdles for the success of gene therapy?
A.
Short-lived nature – Before gene therapy can become a permanent cure for a condition, the therapeutic DNA introduced into target cells must remain functional & the cells containing the therapeutic DNA must be stable. Problems with integrating therapeutic DNA into the genome & the rapidly dividing nature of many cells prevent it from achieving long-term benefits. Patients require multiple treatments.
B.
Immune response – Any time a foreign object is introduced into human tissues, the immune system is stimulated to attack the invader. Stimulating the immune system in a way that reduces gene therapy effectiveness is possible.
C.
Multigene disorders – Some commonly occurring disorders, such as heart disease, high blood pressure, Alzheimer's disease, arthritis, & diabetes, are affected by variations in multiple genes, which complicate gene therapy.
D.
Some therapies may breach the Weismann barrier (between soma and germ-line) protecting the testes, potentially modifying the germline, falling afoul of regulations in countries that prohibit the latter practice.
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【单选题】儿童几岁对不同的音高有反应,会注意持续音的音高,开始模仿声音?
A.
0-6个月
B.
6个月-1.5岁
C.
1.5岁-4岁
D.
4岁-8岁
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【单选题】In wild-type flowering plants, carpel development is determined by what class of gene products?
A.
A gene products
B.
A + B gene products
C.
B + C gene products
D.
C gene products
E.
A + C gene products
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【单选题】What is the main purpose of writing this passage?
A.
Expressing the writer's idea that gene technology will benefit people.
B.
Telling people the advantages and disadvantages of gene technology.
C.
Telling the readers that gene technology will not benefit people.
D.
Explaining that gene technology will also do harm to the humanity.
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【简答题】如图，菱形ABCD的边长为6，∠BAD=60°，AC∩BD=O．将菱形ABCD沿对角线AC折起，得到三棱锥B-ACD，点M是棱BC的中点， DM=3 2 ． （Ⅰ）求证：OM ∥ 平面ABD； （Ⅱ）求证：平面ABC⊥平面MDO； （Ⅲ）求三棱锥M-ABD的体积．
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相关题目：
【简答题】如图，在菱形ABCD中，∠BAD=2∠B，AB=6cm，则AC=（    ）cm。
查看完整题目与答案
【单选题】如图，在菱形ABCD中，∠A=60°，E、F分别是AB、AD的中点．若EF=2，则菱形ABCD的边长为（　　）
A.
4
B.
5
C.
6
D.
7
查看完整题目与答案
【单选题】what is gene?
A.
DNA that encodes specific protein
B.
RNA
C.
codon
D.
allele
查看完整题目与答案
【单选题】What is the primary objective of carrying out the Pine Gene Discovery Project?
A.
To speed up old-fashioned breeding methods.
B.
To identify all the genes in the pine tree's genome.
C.
To find out what desired traits the pine trees have.
D.
To make it easier to know which gene needs altering.
查看完整题目与答案
【单选题】The cI gene of phage is of what type?
A.
Repressor
B.
Inducer
C.
Promoter
D.
Silent gene
查看完整题目与答案
【多选题】What are the major hurdles for the success of gene therapy?
A.
Short-lived nature – Before gene therapy can become a permanent cure for a condition, the therapeutic DNA introduced into target cells must remain functional & the cells containing the therapeutic DNA must be stable. Problems with integrating therapeutic DNA into the genome & the rapidly dividing nature of many cells prevent it from achieving long-term benefits. Patients require multiple treatments.
B.
Immune response – Any time a foreign object is introduced into human tissues, the immune system is stimulated to attack the invader. Stimulating the immune system in a way that reduces gene therapy effectiveness is possible.
C.
Multigene disorders – Some commonly occurring disorders, such as heart disease, high blood pressure, Alzheimer's disease, arthritis, & diabetes, are affected by variations in multiple genes, which complicate gene therapy.
D.
Some therapies may breach the Weismann barrier (between soma and germ-line) protecting the testes, potentially modifying the germline, falling afoul of regulations in countries that prohibit the latter practice.
查看完整题目与答案
【单选题】儿童几岁对不同的音高有反应,会注意持续音的音高,开始模仿声音?
A.
0-6个月
B.
6个月-1.5岁
C.
1.5岁-4岁
D.
4岁-8岁
查看完整题目与答案
【单选题】In wild-type flowering plants, carpel development is determined by what class of gene products?
A.
A gene products
B.
A + B gene products
C.
B + C gene products
D.
C gene products
E.
A + C gene products
查看完整题目与答案
【单选题】What is the main purpose of writing this passage?
A.
Expressing the writer's idea that gene technology will benefit people.
B.
Telling people the advantages and disadvantages of gene technology.
C.
Telling the readers that gene technology will not benefit people.
D.
Explaining that gene technology will also do harm to the humanity.
查看完整题目与答案
【简答题】如图，菱形ABCD的边长为6，∠BAD=60°，AC∩BD=O．将菱形ABCD沿对角线AC折起，得到三棱锥B-ACD，点M是棱BC的中点， DM=3 2 ． （Ⅰ）求证：OM ∥ 平面ABD； （Ⅱ）求证：平面ABC⊥平面MDO； （Ⅲ）求三棱锥M-ABD的体积．
查看完整题目与答案
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