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【单选题】
听诊时听到的第一心音主要是由下列哪一因素产生?A.
半月瓣开放
B.
半月瓣关闭
C.
房室瓣开放
D.
房室瓣关闭
E.
血液冲入心室,引起心室壁振动
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举一反三
【单选题】_______ the illegal mobile WAP sites worries many parents. [ ]
A.
The children's surfing
B.
The children surf
C.
The children surfing
D.
The children have surfed
【简答题】听短文，根据其内容选出能完成下列句子的最佳答案。短文读两遍。 1. Many like going to pet show. [ ] A. children B. old men C. s 2. The children like it most when they ride on . [ ] A. an elephant B. a goat C. a cow 3. Th...
【单选题】— How many ______ are there in your class? — About 63. [ ]
A.
childs
B.
childrens
C.
children
D.
child
【单选题】命题p：?x∈R，cosx＞1的否定是（ ）
A.
￢p：?x∈R，cosx≤1
B.
￢p：?x∈R，cosx≤1
C.
￢p：?x∈R，cosx＜1
D.
￢p：?x∈R，cosx＜1
【简答题】阅读理解。 It was Sports Day at School. There were many races. Lots of parents were watching the children. There was a large crowd of people. Some girls were talking about the races. They were talking abou...
【简答题】She must be very tired. _______so many little childrenis a very hard job. A. To have looked after B. Having lookedafter B. Look after D. Looking after
【单选题】已知命题p：?x∈R，cosx≤1，则（ ）
A.
￢p：?x∈R，cosx≥1
B.
￢p：?x∈R，cosx＜1
C.
￢p：?x∈R，cosx≤1
D.
￢p：?x∈R，cosx＞1
【单选题】We have too many people in our country. Their life will be ___________ if there are ___________ children in a family.
A.
richer; fewer
B.
poorer; fewer
C.
richer; more
D.
richer; less
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