__________ to some parts of South America is still difficult, because parts of the continent are still covered with thick forests.
举一反三
- It is so difficult to ______ the bottom of the ocean because some parts are very deep.
- It's sorry difficult to___ the bottom of the ocean. Because some parts are very deep.
- It is so difficult to ________ the bottom of the ocean because some parts are very deep. A: explain B: exploit C: explore D: accept
- It is so difficult to the bottom of the ocean because some parts are very deep. A: explore B: know C: develop D: observe
- It is so difficult to __________ the bottom of the ocean because some parts are very deep. A: explore B: pose C: inherit D: transmit