单项选择题

According to Krashen, ______ refers to the gradual and subconscious development of L1 ability by using it naturally in daily communicative context.

A．acquisition
B．learning
C．competence
D．performance
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______ is the American poet whose work was first recognized in England and then in Americ
A． Robert FrostB. Wallace StevensC. Walt WhitmanD. Emily Dickinson
单项选择题
The discovery of dinosaur fossil sites in Bolivia is exciting because of the following reasons EXCEPT that
A．they are found in a continent other than Asia and North Continent.
B．the largest dinosaurs in the world are found in this discovery.
C．there are some unknown species of dinosaurs found this time.
D．the dinosaurs were believed to be some of the last ones on earth.
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