The train came to an abrupt stop, making us wonder where we were.

单项选择题Cheour’s finding is worthless.

单项选择题If an adult wants to learn a language faster, he can put a language tape under his pillow.

单项选择题The study shows that the infant’s cerebral cortex is working while he is asleep.

单项选择题The three vowels mentioned in this article are all Finnish sounds.

单项选择题Finnish vowels are easy to distinguish.