黏土岩极易吸收钻井液中的自由水膨胀而导致（）。

A、井径缩小

B、泥包钻头

C、井斜

D、井漏

Passage One

Which of the following statements is NOT true of Trinidadian workers who were made jobless in early September

A．They held protests against the government on the street.

B．They became independent cane farmers.

C．They were compensated with a total of 115 million dollars.

D．They were given the chance of retraining for new job careers.