What did the womans parents do in Central America？
A. To travel around the area.
B. To volunteer their services.
C. To teach in some schools.
D. To visit relatives in the area.
查看答案
The problem of the standard educational tests is caused by______.
A. well-informed users
B. imprecise standard
C. users who have not enough knowledge of the test
D. people who attack the test
What can be inferred from the news item？
A. There has been an internal struggle among right-wingers.
B. These letter bombs were all made in Sweden.
C. There has been no injury during the raids.
D. The letter bombs have caused great damage.
Whats the main idea of the news item？
A. The EU government provides cheap loans to help Airbus develop new aircraft.
B. The US government subsidizes the Boeing Company by giving it government contracts.
C. The EU and the US try to find a negotiated settlement on trade war.
D. The US makes a new complaint against the EU subsidies for the aircraft maker Airbus.
熔模铸造中模料的热胀冷缩()，才能提蜡模的尺寸精度，也才能减少脱蜡时因模料膨胀引起的型壳胀裂现象
A. 大
B. 小
C. 不影响
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