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【简答题】
什么叫热机效率?写出它的计算式。
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【单选题】Si nous sommes en difficulté, il nous_________.
A.
secourra
B.
secourira
C.
secourrait
D.
secourirait
【简答题】阅读下面短文, 按照句子结构的语法性和上下文连贯的要求, 在空格处填入一个适当的词或使用括号中词语的正确形式填空. My father died when I was (1)________ little kid. We were too poor (2)________ buy food. My mother got two part-time jobs to pay for (3)______...
【单选题】It is difficult for a teacher to give attention to children in a large class．We should reform the situation in order to meet each child’s needs．
A.
private
B.
personal
C.
individual
D.
single
【简答题】American Friendship America is a mobile society. Friendships between Americans can be close and 1 , yet disappear soon if situations change.Neither si de feels hurt by this. Both may 2 Christmas greet...
【单选题】The word 'fix' in 'you are caught in a fix' in paragraph 1 refers to ______.
A.
difficult situation
B.
your preference of one choice
C.
what is left behind
D.
two things are to be done at the same time
【简答题】During the 19th century, natural gas was used on a local scale because of the difficult situation in___________.
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