单项选择题

The number of tourists from the west (have) (more than doubled) since China (adopted) the open door policy two decades (ago).

A．have
B．more than doubled
C．adopted
D．ago
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You will (not be able) to pass your examination (except) you study (harder) than you (do) now.
A．not be able
B．except
C．harder
D．do
单项选择题
(As is known) to (all), sometimes it is very difficult (to tell) the difference between technical English (from everyday English).
A．As is known
B．all
C．to tell
D．from everyday English
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