单项选择题

Unless the application of a new discovery is clear and present, most are dubious of its value（）

A．除非新发明的应用立即收到实效，否则其价值将成为最可疑的。
B．如果新发明不能立即收到实效的话，那么其价值会是最可疑的。
C．一种新发明的应用如果不能立即收到实效的话，大多数人就会怀疑它的价值。
D．如果新发明立即收到实效的话，那么其价值会是最可疑的。

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热门试题

单项选择题

Before he became American president, John Kennedy（）

A．kept a record of events in the Navy
B．was the owner of a newspaper
C．was three times elected to the House of Representatives
D．studied law in the university

单项选择题

According to the passage, which of the following is TRUE（）

A．He was the youngest American elected president.
B．He was the richest American elected president.
C．He became president because he fought in the World War Ⅱ.
D．He became president because his family had suffered scandals.