Green sea turtles(海龟) are the world’ s largest species of hard-shelled sea turtle. While most individuals weigh about 136 to 181 kilograms, some can be (56)\_\_\_\__ heavy as 204 kilograms. These tu
Passage 1Questions 1 to 5 are based on the following passage. The two claws of the mature American lobster are decidedly different from each other. The crusher claw is short and stout; the cutter cla