单项选择题

Bed rest is advised（）

A.for a maximum of two days.
B.for extreme pain only.
C.for pain lasting more than two days.

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单项选择题The back is different from other parts of the body because（）

A.it is usually better at self-repair.
B.a back injury is usually more painful.
C.its response to injury often results in more damage.

单项选择题According to the text, the greatest progress in rocket technology was madeA from the tenth to the thirteenth centuries. B from the seventeenth to the nineteenth centuries. C from the early nineteenth to the late nineteenth century. D from the late nineteenth century to the present day.

According to the text, the greatest progress in rocket technology was madeA from the tenth to the thirteenth centuries. B from the seventeenth to the nineteenth centuries. C from the early nineteenth to the late nineteenth century. D from the late nineteenth century to the present day.