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【单选题】
生殖细胞包括精子和卵子,发生过程中经过两次减数分裂,均为单倍体细胞,即仅有23条染色体,其中22条是常染色体,1条是性染色体。精子在女性生殖管道内的受精能力可维持A.
8小时
B.
12小时
C.
1天
D.
2天
E.
3天
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举一反三
【单选题】Which of the following is TRUE?
A.
Chinese people find it very easy to learn the names of English people.
B.
English people find it very easy to learn the names of American people.
C.
Jenny finds it very easy to learn the names of students from all over the world.
D.
Any name is very difficult to learn.
【简答题】What do these stressors have in common and what can we do to cope with them?
【单选题】Which of the following is INCORRECT according to the story?
A.
Both of the parents had an enjoyable day.
B.
Both parents and children had great experiences.
C.
Both parents and children learned something about how to spend money.
D.
Both the son and daughter had spent all their money.
【多选题】What can we do to multi-task better in interpreting?
A.
To make each sub-task routine or automatic by practice
B.
To make the brain energy pool larger through great concentration
C.
To allocate brain energy more effectively
【多选题】What can we do to promote environmental protection in our daily life?
A.
Save all resources that we could save
B.
Take action to promote recycling
C.
Fight against all kinds of pollution
D.
Promote the idea to people around us
【单选题】— What can we do to help animals in nature reserves?— We can .A．keep hunters away from reservesB．
A.
— What can we do to help animals in nature reserves? — We can ____. A．keep hunters away from reserves
B.
take their babies home
C.
cut down some trees in reserves
D.
encourage farmers to grow more rice in reserves
【单选题】Expenditure increased on all the following EXCEPT______.
A.
food
B.
automobiles
C.
education
D.
entertainment
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