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【單選題】
設(shè)兩人造地球衛(wèi)星的質(zhì)量比為1∶2 ，到地球球心的距離比為1∶3 ，則它們的
A.
周期比為3∶1
B.
線速度比為1∶ 
C.
向心加速度比為9∶1
D.
向心力之比為1∶18
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舉報參考答案：
舉一反三
【單選題】A meeting was held ______ those who lost their lives in the fight against SARS.
A.
in honor of
B.
in praise of
C.
in case of
D.
in face of
【單選題】What’s the best title for Paragraph 4?
A.
Study for one hour each time.
B.
Do something difficult.
C.
Study in different ways.
D.
Change subjects.
【單選題】The writer wrote the passage to______.
A.
encourage us to try to concentrate
B.
teach us how to concentrate while studying
C.
give us the reasons for a lack of concentration
D.
list the benefits we can get from concentration
【單選題】In the last paragraph, the writer suggests that______.
A.
we just read the heading of some articles
B.
we do our best to read an article straight through
C.
we ask ourselves questions about what we are reading
D.
we ask other people questions about the article we are reading
【單選題】The old man was sad because _________.
A.
his three sons had to join the army
B.
his three sons lost their lives during the war
C.
he lived in the small town alone
D.
he had neither food nor clothes
相關(guān)題目：
【單選題】A meeting was held ______ those who lost their lives in the fight against SARS.
A.
in honor of
B.
in praise of
C.
in case of
D.
in face of
【單選題】What’s the best title for Paragraph 4?
A.
Study for one hour each time.
B.
Do something difficult.
C.
Study in different ways.
D.
Change subjects.
【單選題】The writer wrote the passage to______.
A.
encourage us to try to concentrate
B.
teach us how to concentrate while studying
C.
give us the reasons for a lack of concentration
D.
list the benefits we can get from concentration
【單選題】In the last paragraph, the writer suggests that______.
A.
we just read the heading of some articles
B.
we do our best to read an article straight through
C.
we ask ourselves questions about what we are reading
D.
we ask other people questions about the article we are reading
【單選題】The old man was sad because _________.
A.
his three sons had to join the army
B.
his three sons lost their lives during the war
C.
he lived in the small town alone
D.
he had neither food nor clothes
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